Bisphosphine, process for producing the same, and use thereof
CA 2478256 A1 · Owner: Kuraray Co. Ltd. · Inventors: Tsuji, Tomoaki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A bisphosphine represented by the general formula (I): (I) (wherein Ar1 and Ar2 each represents arylene; R1 and R2 each represents alkyl or aryl or R1 and R2 may form a ring in cooperation with the phosphorus atom bonded thereto; R3 and R4 each represents hydrogen or alkyl; and the two carbon atoms each having R3 and R4 are bonded in positions ortho to the oxygen atom bonded to Ar1 and Ar2); a process for producing the bisphosphine; a Group VIII metal complex having the bisphosphine as a component; and a process in which an ethylenically unsaturated compound is hydroformylated with carbon monoxide and hydrogen with the aid of the Group VIII metal complex to produce the …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed January 10, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 10, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 10, 2025.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.